I think, it’s the number on the book.
Hey, everyone!
or mb the folder/book or whatever orange under the table? hi @Jabin_Quaken, good to see ya, tell me sth I musn´t think on…lol 
Nope. I’m taking Calculus this year, so that book’s usually there.
Nope. When I’m studying my cat is usually around, so I give her treats every once in a while. (the cat is on a lawnmower btw)
Nope!
No, that’s there because it’s how my (high) school checks out textbooks to students. It serves as a serial number
The odd thing out is on the table 
Then, it’s the pencil shaving on one of the pencils.
Wrong again!
The piece of a puzzle on the right?
Is it… the little empty candy containers laying between the calculus book and the lined paper?
You got it, yay 
Those are hand sanitizer bottles
LOL 
So is maths the only thing you’re taking or is it part of a bigger subject/course?
Is it the blue thing beneath the necklace @Jabin_Quaken?
The pen? No.
Oh, is that part of it?
Then the modelling clay in the open box?
What do you mean?
Ah! Nope! Those are the pieces of art eraser. Used and fresh ones. This stuff is normal for my wife’s things.
The compass then?
Not that. As you can see, it’s one piece with the thermometer, which we use in our apartment.
Then it’s gotta be the mp3 player.
No. My wife often uses it while drawing.